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Biomechanical finite element analysis of short-implant-supported, 3-unit, fixed CAD/CAM prostheses in the posterior mandible

Objective To assess the biomechanical effects of different prosthetic/implant configurations and load directions on 3-unit fixed prostheses supported by short dental implants in the posterior mandible using validated 3-D finite element (FE) models. Methods Models represented an atrophic mandible, mi...

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Published in:International journal of implant dentistry 2022-02, Vol.8 (1), p.8-8, Article 8
Main Authors: Zupancic Cepic, Lana, Frank, Martin, Reisinger, Andreas, Pahr, Dieter, Zechner, Werner, Schedle, Andreas
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Frank, Martin
Reisinger, Andreas
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Zechner, Werner
Schedle, Andreas
description Objective To assess the biomechanical effects of different prosthetic/implant configurations and load directions on 3-unit fixed prostheses supported by short dental implants in the posterior mandible using validated 3-D finite element (FE) models. Methods Models represented an atrophic mandible, missing the 2nd premolar, 1st and 2nd molars, and rehabilitated with either two short implants (implant length-IL = 8 mm and 4 mm) supporting a 3-unit dental bridge or three short implants (IL = 8 mm, 6 mm and 4 mm) supporting zirconia prosthesis in splinted or single crowns design. Load simulations were performed in ABAQUS (Dassault Systèmes, France) under axial and oblique (30°) force of 100 N to assess the global stiffness and forces within the implant prosthesis. Local stresses within implant/prosthesis system and strain energy density (SED) within surrounding bone were determined and compared between configurations. Results The global stiffness was around 1.5 times higher in splinted configurations vs. single crowns, whereby off-axis loading lead to a decrease of 39%. Splinted prostheses exhibited a better stress distribution than single crowns. Local stresses were larger and distributed over a larger area under oblique loads compared to axial load direction. The forces on each implant in the 2-implant-splinted configurations increased by 25% compared to splinted crowns on 3 implants. Loading of un-splinted configurations resulted in increased local SED magnitude. Conclusion Splinting of adjacent short implants in posterior mandible by the prosthetic restoration has a profound effect on the magnitude and distribution of the local stress peaks in peri-implant regions. Replacing each missing tooth with an implant is recommended, whenever bone supply and costs permit.
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Methods Models represented an atrophic mandible, missing the 2nd premolar, 1st and 2nd molars, and rehabilitated with either two short implants (implant length-IL = 8 mm and 4 mm) supporting a 3-unit dental bridge or three short implants (IL = 8 mm, 6 mm and 4 mm) supporting zirconia prosthesis in splinted or single crowns design. Load simulations were performed in ABAQUS (Dassault Systèmes, France) under axial and oblique (30°) force of 100 N to assess the global stiffness and forces within the implant prosthesis. Local stresses within implant/prosthesis system and strain energy density (SED) within surrounding bone were determined and compared between configurations. Results The global stiffness was around 1.5 times higher in splinted configurations vs. single crowns, whereby off-axis loading lead to a decrease of 39%. Splinted prostheses exhibited a better stress distribution than single crowns. Local stresses were larger and distributed over a larger area under oblique loads compared to axial load direction. The forces on each implant in the 2-implant-splinted configurations increased by 25% compared to splinted crowns on 3 implants. Loading of un-splinted configurations resulted in increased local SED magnitude. Conclusion Splinting of adjacent short implants in posterior mandible by the prosthetic restoration has a profound effect on the magnitude and distribution of the local stress peaks in peri-implant regions. Replacing each missing tooth with an implant is recommended, whenever bone supply and costs permit.</description><identifier>ISSN: 2198-4034</identifier><identifier>EISSN: 2198-4034</identifier><identifier>DOI: 10.1186/s40729-022-00404-8</identifier><identifier>PMID: 35147791</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer Berlin Heidelberg</publisher><subject>Artificial Limbs ; Axial loads ; Biomechanical engineering ; Biomechanics ; CAD/CAM ; CAM ; Computer aided manufacturing ; Computer-Aided Design ; Configurations ; Dental bridges ; Dental Implants ; Dentistry ; Finite Element Analysis ; Finite element method ; Fixed implant-supported prostheses ; Flux density ; Functional load ; Mandible - surgery ; Mathematical models ; Medicine ; Prostheses ; Prosthetic design parameters ; Short dental implants ; Stiffness ; Stress distribution ; Surgical implants ; Transplants &amp; implants ; Zirconium dioxide</subject><ispartof>International journal of implant dentistry, 2022-02, Vol.8 (1), p.8-8, Article 8</ispartof><rights>The Author(s) 2022</rights><rights>2022. The Author(s).</rights><rights>The Author(s) 2022. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). 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Methods Models represented an atrophic mandible, missing the 2nd premolar, 1st and 2nd molars, and rehabilitated with either two short implants (implant length-IL = 8 mm and 4 mm) supporting a 3-unit dental bridge or three short implants (IL = 8 mm, 6 mm and 4 mm) supporting zirconia prosthesis in splinted or single crowns design. Load simulations were performed in ABAQUS (Dassault Systèmes, France) under axial and oblique (30°) force of 100 N to assess the global stiffness and forces within the implant prosthesis. Local stresses within implant/prosthesis system and strain energy density (SED) within surrounding bone were determined and compared between configurations. Results The global stiffness was around 1.5 times higher in splinted configurations vs. single crowns, whereby off-axis loading lead to a decrease of 39%. Splinted prostheses exhibited a better stress distribution than single crowns. Local stresses were larger and distributed over a larger area under oblique loads compared to axial load direction. The forces on each implant in the 2-implant-splinted configurations increased by 25% compared to splinted crowns on 3 implants. Loading of un-splinted configurations resulted in increased local SED magnitude. Conclusion Splinting of adjacent short implants in posterior mandible by the prosthetic restoration has a profound effect on the magnitude and distribution of the local stress peaks in peri-implant regions. Replacing each missing tooth with an implant is recommended, whenever bone supply and costs permit.</description><subject>Artificial Limbs</subject><subject>Axial loads</subject><subject>Biomechanical engineering</subject><subject>Biomechanics</subject><subject>CAD/CAM</subject><subject>CAM</subject><subject>Computer aided manufacturing</subject><subject>Computer-Aided Design</subject><subject>Configurations</subject><subject>Dental bridges</subject><subject>Dental Implants</subject><subject>Dentistry</subject><subject>Finite Element Analysis</subject><subject>Finite element method</subject><subject>Fixed implant-supported prostheses</subject><subject>Flux density</subject><subject>Functional load</subject><subject>Mandible - surgery</subject><subject>Mathematical models</subject><subject>Medicine</subject><subject>Prostheses</subject><subject>Prosthetic design parameters</subject><subject>Short dental implants</subject><subject>Stiffness</subject><subject>Stress distribution</subject><subject>Surgical implants</subject><subject>Transplants &amp; 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implants</topic><topic>Zirconium dioxide</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zupancic Cepic, Lana</creatorcontrib><creatorcontrib>Frank, Martin</creatorcontrib><creatorcontrib>Reisinger, Andreas</creatorcontrib><creatorcontrib>Pahr, Dieter</creatorcontrib><creatorcontrib>Zechner, Werner</creatorcontrib><creatorcontrib>Schedle, Andreas</creatorcontrib><collection>SpringerOpen</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>ProQuest Health &amp; Medical Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Hospital Premium Collection</collection><collection>Hospital Premium Collection (Alumni Edition)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Materials Science &amp; 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Methods Models represented an atrophic mandible, missing the 2nd premolar, 1st and 2nd molars, and rehabilitated with either two short implants (implant length-IL = 8 mm and 4 mm) supporting a 3-unit dental bridge or three short implants (IL = 8 mm, 6 mm and 4 mm) supporting zirconia prosthesis in splinted or single crowns design. Load simulations were performed in ABAQUS (Dassault Systèmes, France) under axial and oblique (30°) force of 100 N to assess the global stiffness and forces within the implant prosthesis. Local stresses within implant/prosthesis system and strain energy density (SED) within surrounding bone were determined and compared between configurations. Results The global stiffness was around 1.5 times higher in splinted configurations vs. single crowns, whereby off-axis loading lead to a decrease of 39%. Splinted prostheses exhibited a better stress distribution than single crowns. Local stresses were larger and distributed over a larger area under oblique loads compared to axial load direction. The forces on each implant in the 2-implant-splinted configurations increased by 25% compared to splinted crowns on 3 implants. Loading of un-splinted configurations resulted in increased local SED magnitude. Conclusion Splinting of adjacent short implants in posterior mandible by the prosthetic restoration has a profound effect on the magnitude and distribution of the local stress peaks in peri-implant regions. Replacing each missing tooth with an implant is recommended, whenever bone supply and costs permit.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><pmid>35147791</pmid><doi>10.1186/s40729-022-00404-8</doi><tpages>1</tpages><orcidid>https://orcid.org/0000-0003-1205-4359</orcidid><oa>free_for_read</oa></addata></record>
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subjects Artificial Limbs
Axial loads
Biomechanical engineering
Biomechanics
CAD/CAM
CAM
Computer aided manufacturing
Computer-Aided Design
Configurations
Dental bridges
Dental Implants
Dentistry
Finite Element Analysis
Finite element method
Fixed implant-supported prostheses
Flux density
Functional load
Mandible - surgery
Mathematical models
Medicine
Prostheses
Prosthetic design parameters
Short dental implants
Stiffness
Stress distribution
Surgical implants
Transplants & implants
Zirconium dioxide
title Biomechanical finite element analysis of short-implant-supported, 3-unit, fixed CAD/CAM prostheses in the posterior mandible
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